How to Async Subtract Dates in PHP - Code Snippet

// Task: Async Subtract Dates
// Language: PHP

function async_subtract_dates() {
    // Implementation for Async Subtract Dates
    $ result = ...; // Initialize variable
    // TODO: Implement core logic here
    // Step 1: Prepare data
    // Step 2: Process Async Subtract Dates
    echo("Done");
}